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Recent questions tagged first-order-reactions

A certain reaction is first order, and 540 s after initiation of the reaction, 32.5% of the reactant remains. At what time after initiation of the reaction of the reaction will 10% of the reactant remain?

asked Jul 25, 2014 by balaji.thirumalai

1 answer

A certain first order reaction is 45% complete in 65 seconds. Determine the rate constant and the half-life for this process.

asked Jul 25, 2014 by balaji.thirumalai

1 answer

Calculate half-life for first-order reaction if 68% of a substance is reacted within 66 s.

asked Jul 25, 2014 by balaji.thirumalai

1 answer

The thermal decomposition of phosphine to phosphorus and hydrogen gas is a first order reaction, with a half-life of 35 s at 680$^\circ$C. Calculate the time required for 95% of phosphine to decompose.

asked Jul 24, 2014 by balaji.thirumalai

1 answer

A certain first order reaction proceeds through t first order kinetics. The half-life of the reaction is 180 s. What percent of the initial concentration remains after 900s?

asked Jul 24, 2014 by balaji.thirumalai

1 answer

From the integrated rate law for a first order reaction, $ [A] = [A]_0\; e^{-kt}$. Suppose rate constant, $k = 2.95 X 10^{-3} s^{-1}$, What percent of $A$ remains after $150 \;s$?

asked Jul 24, 2014 by balaji.thirumalai

1 answer

Which of following statements is incorrect for a first order reaction, where $T_x$ is the time taken for the reactant to drop by that % number.

asked Dec 19, 2013 by sreemathi.v

1 answer

The gas -phase thermal decomposition of one mole of $(CH_3)_3CO_2C(CH_3)_3$ in a constant volume apparatus yields two moles of acetone and one mole of ethane.If the reaction obeys ${1^{st}}$ order then which of the following is true?

asked Dec 19, 2013 by sreemathi.v

1 answer

Which of these changes with time for $1^{st}$ order reaction $(i)\;\text{rate of reaction}\\(ii)\;\text{rate constant}\\(iii)\;\text{half life}\\(iv)\;\text{concentration of reactant}$

asked Dec 18, 2013 by sreemathi.v

1 answer

For a first order reaction $A\rightarrow 2B$ ,graph for $\large\frac{d[B]}{dt}$ vs $\large\frac{-d[A]}{dt}$ is

asked Dec 16, 2013 by sreemathi.v

1 answer

A first order reaction is represented by which of the following graphs?

asked Dec 13, 2013 by sreemathi.v

1 answer

Oxide layer formation on a metal is a $Rx_n$ which is of first order with rate constant $10^{-8}min^{-1}$ if maximum thickness can be $2mm$ then what time will be taken to form a oxide layer of thickness $1.5mm$

asked Dec 13, 2013 by sreemathi.v

1 answer

For a first order $Rx_n$ of rate constant K,$\;t_{ 2/3}$ the time of a reactant to drop to $1/3$) is given by:

asked Dec 13, 2013 by sreemathi.v

1 answer

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